AED490 Cheap Flights from St. Louis (STL) to Washington (DCA)

View AED490 flight on Thu, 20 November 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA)

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Cheap Flights from St. Louis to Washington (STL-DCA)

Prices were available within the past 7 days and start at AED490 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frequently asked questions

How long does it take to fly from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA)?
Purchase your ticket with American Airlines and you can expect to be cruising the skies for around 1 hour and 56 minutes. This leading airline has a direct flight that departs at 5:04PM from STL and reaches Ronald Reagan Washington National Airport (DCA) at 8:00PM. Expedia has some amazing flight deals, so check out what's available on this route today.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to National Airport last minute?
When it comes to booking your flights, being prepared pays off. While you could pick up a deal on a Lambert Field to Ronald Reagan Washington National Airport (DCA) flight at the last minute, prices usually don't get cheaper as the departure date nears. Based on flight pricing and demand studies in 2022, we have found that the sweet spot to book a domestic flight is between 28 – 35 days ahead. For international journeys it's three to four months.
What airports do you fly into for Washington from St. Louis?
From St. Louis, you can connect to Washington via Ronald Reagan Washington National Airport (DCA), Washington Dulles Intl. Airport (IAD) and Baltimore Washington Intl. Thurgood Marshall Airport (BWI). Find out which airport is the right option for you before you make a decision. If you choose Ronald Reagan Washington National Airport (DCA), it's roughly 6 kilometers south of downtown. Use the money you save when booking your airfare with Expedia to tour the city's awesome attractions, such as White House and United States Capitol.
What are the most popular departure times for flights from Lambert Field to DCA?
The most popular departure times for trips from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA) are between 6:00 AM - 7:00 AM on American Airlines. Our tip is to take off in the morning. The earlier you set off, the better your chances of arriving on time with lighter air traffic in the sky.
Can I change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Ronald Reagan Washington National Airport (DCA)?
We know life happens and plans change, so Expedia is here to help make amending your journey as easy as possible. First, find your STL to Ronald Reagan Washington National Airport (DCA) itinerary through the Expedia Trips portal and browse the ticket rules to see if change fees apply. If you purchased your ticket in the last 24 hours, some carriers will let you cancel without charge and organize new flights. If you bought your fare more than 24 hours ago, connect with us via our Customer Service portal to run through your options.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Ronald Reagan Washington National
Distance
1147 km
Average flight time
3 hours 1 min

Book with confidence

St. Louis to Washington Flights

Whether you’re looking for a grand adventure or just want to get away for a last-minute break, flights from St. Louis to Washington offer the perfect respite. Not only does exploring Washington provide the chance to make some magical memories, dip into delectable dishes, and tour the local landmarks, but the cheap airfare means you won’t bust your budget. So no matter whether your ideal itinerary involves flying one way, non-stop, or round trip, you’re bound to find flights that match your schedule on Expedia, and at prices that won’t shock your wallet.

Bagging a cheap flight from St. Louis to Washington may mean more dollars to spend on for one-of-a-kind souvenirs when you arrive, but it doesn’t mean you have to skimp on your travel experience, as Expedia offers a sizzling selection of cheap airlines that’ll put you in your happy place on their planes, whether that’s getting lost in a hair-raising airport thriller, dreaming on the passing landscape over a glass of bubbly, or jotting down your vacation bucket list at 38,000 feet. There’s also bound to be plenty of opportunities to snap a few photos of the high life that will make your friends green with envy. After all, enjoying the journey is part of the fun.

With so many affordable flights and so many wonderful adventures awaiting you, there’s no reason to put off booking a fantastic flight from STL to DCA today. So don’t leave it to the last minute to make your dream trip a reality: pack your bags with your go-to travel accessories, put together your list of must-see attractions and can’t-miss activities, and get ready to broaden your horizons – with Expedia, the wonders of Washington are only a plane trip away. Book your travel arrangements with us today!

If you would like to book flights to Washington more flexibly many prefer to purchase one-way tickets with options to take different airlines. A one way ticket to Washington is AED490 now!

St. Louis to Washington Flights

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